Improvement in rectangular-mortise cutters



2 Sh eetsSheet 2,

J. DOYLE. RECTANGULAR MORTISE-CUT'I'ER.

Patented Dec. '14 1875.

M a H INVENTOR ATTORNEYS N. PETERS, FROTO-LITHOGRAPHER, WASHINGTON. D.C.

UNITED STATES PATENT Orrlon.

JOHN DOYLE, OF HOBOKEN, NEW JERSEY.

IMPROVEMENT IN RECTANGULAR-MORTISE CUTTERS.

Specification forming part of Letters Patent No. 1 71,109, datedDecember 14, 1875; application filed August 7, 1875.

To all whom it may concern:

Be it known that 1, JOHN DOYLE, of Hoboken, in the county of Hudson andState of New Jersey, have invented a new and valuable Improvement inRectangular-Mortise Gutters; and I do hereby declare that the followingis a full, clear, and exact description of the construction andoperation of the same, reference being bad to the annexed drawingsmaking a part of this specification, and to the letters and figures ofreference marked thereon. i

Figures 1 and 2 of the drawings are representations of front views of myrectangularmortise-cutting machine, and Fig. 3 is'a transverse verticalsectional view thereof. Fig. 4 is a perspective view of the oscillatingplate and cutters.

This invention has relation to improvements in boring devices.

The object of the invention is mainly to devise a machine which willproduce a square or rectangular mortise when properly actuated in abeam, timber, or other like article; and the nature of the inventionconsists in the arrangement, novel construction, and co-relation of thevarious devices used and employed, whereby very useful results areobtained, as will be hereinafter more fully explained and claimed".

In the annexed drawings, the letter A designates the body or frame of myimproved machine, Which is designed to be rigidly secured in a verticalposition to a suitable support, and which is provided with anendwise-movable and vertically-adjustable sash-slide, B, to the lowerend of which a rectangular bracket, 0, is rigidly secured, whichbracketis designed to receive and hold against downward displacement thebeam or other article to be mortised. The table a of this bracket isprovided with griping-points b, which serve the purpose of holding thebeam against endwise or other displacement, and with a centralrectangular opening, (2, the object of which will hereinafter appear.

Sash-slideB is moved vertically up and down, for the purpose ofraisingthe timber to be mortised up to the cutting-tool, and of lowering it forthe purpose of disengaging it from the said cutting-tool when themortise is made, in the following manner, to wit: A strong metallicplate, 0, is rigidly secured upon the lower edge of frame A, subtending,as it were, the opening in which slide B works. Through this plate ispassed a suitable screw, S, which is held against downward displacement,in relation to plate 0, by means of a collar, d, applied thereon abovethe said plate, and which is passed through a screw-threaded nut, e,arranged in a fixed position in a recess, f, of suitable depth in thesaid slide. When the said screw is operated by means of a suitablecrank-arm, D, in a given direction, the effeet will be to raise theslide, and with it the table, thus carrying up the timber as it is cutaway in making the mortise, and holding it in contact with thecutting-edge of the mortising-tool, a reversal of this movement havingthe effect of lowering the slide, and with it the table and timber, thuswithdrawing the latter from the tool, and disengaging the latter from acompleted mortise in the latter. E represents a disk or plate ofsuitable metal, which is pivoted to oscillate vertically in the lowerbifurcated end of an arm, F, rigidly secured to a metallic bar, G, inthe nature of a bridge, spanning the space in frame A in which slide Bmoves. This plate is provided with rectangular-cutting blades g,arranged in a position at right angles to its plane, and nearly, if notquite, at right angles to each other, which plate is endowed with avertically-oscillating movement by means of a connecting-rod, H, pivotedby means of a wrist-pin, h, to cutter-blade-bearing plate E, and bymeans of a wrist-pin, h", to a crankwheel, I, keyed or otherwise rigidlysecured upon the end ofa shaft, J, rotating in suitable bearings i onframe A. Shaft J is actuated by means of an endless belt through the medium of a belt-pulley, K, operated by a suitable mechanical motor; or itmay be rotated by hand through the medium of a crank-arm. It is evident,if this shaft be rotated, that an oscillatory or rocking motion will beimparted to plate E, thus causing its cuttingblades to cut out asegmental shaving alternately from oneend of the mortise an d from theother, so long as the timber is held in contact with the cutting-blades;also, that the said blades being rectangular, and their cuttingedges atright angles to their lateral edges, the

sides and ends of the mortise will be vertical to the longitudinal axisof the beam, and at right angles to each other; consequently the m0r--tise will be square or rectangular, according as the cutting-edges ofthe blades and their lateral edges are of equal length, or the latterare longer than the former.

In practice, plate E will be detachable, so that a variety ofcutter-bearing plates may be used in connection with the same mechanism,holding blades suited to cutting every variety of mortise, whatever beits shape or dimen- SlOIlS.

In practice, also, where heavy timbers are to be mortised, I may electto have the table a stationary, and the oscillating cutter-bearing plateadjustable to or from the timber. By this latter contrivance thenecessity of raising ponderous beams will be obviated.

JOHN DOYLE.

Witnesses:

GUSTAVUS GEORGE, WILLIAM H. DEVLIN.

